Malicious PDF — malware analysis report

Static analysis result for SHA-256 475634813dced10a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-09 16:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1b763db775c021c914757859e13f3c75 SHA-1: 7c630329065296619c646b680d3408ce6812c21d SHA-256: 475634813dced10a20ba4074836304df28086589ed5b840ce5986e461968b3a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS platforms. The ClamAV detection indicates this is a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the detection suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2205

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7e4f3ce7---parib.pdf In PDF document text
    • http://fkm-lux.by/var/upload/file/sodatututare.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/91139227906.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/46213204946.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613241393abd1---85022381931.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/vavogisuvaxalasuguk.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/kuwojelezozuroganisixutif.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/sawoditugen.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161337a3c373f7---29432684821.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/xetam.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/95556229769.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161388eb25aef8---63912821276.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/sefusumiroxi.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/japaxaponuji.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/9664268369.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/87942166125.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/tuwubepirabasi.pdfIn PDF document text
    • http://origo.ws/userfiles/file/kewoxipaxezuxedojaronajo.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908134410657053.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/92886402944.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/mejilokinanoj.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/89499528463.pdfIn PDF document text
    • http://video-cycling.de/files/file/30545368004.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/fubale.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/766d2f580e186ba0671fc1a2beb66d82/befowodijad.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/guzuxopefiduratikisod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=watch+7ds+season+4PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 17456 bytes
SHA-256: d9e764cf1b944dbe5bea06073db1e6f3365cfeff51caf76ddb9b87e41ddf0bc0
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 10352 bytes
SHA-256: 3aa85ca40b05affb59dc1fe1870e4c52aea8cdb696a10b49f92afa9fe5328a43
font_02_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1